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The lens in the adult human eye blocks nearly 100 percent of the sun's UV rays. As part of the normal aging process, the eye's natural lens eventually blocks some short-wavelength blue light as well â the type of blue light most likely to cause damage to the retina and lead to macular degeneration and vision loss.
Laser radiation in the near-infrared region of the spectrum (700-1400nm) is absorbed by the retina. The eye can concentrate a laser beam on the retina as much as 100,000 times. For example, a 1 mW/cm2 irradiance (power density) at the cornea will be 100 W/cm2 at the retina.